Supplemental Disclosure of Noncash Investing and Financing Activities (HOST HOTELS & RESORTS, L.P.) - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2013 Exchangeable Senior Debentures 3.25%	Sep. 30, 2014 HOST HOTELS & RESORTS L.P.	Sep. 30, 2013 HOST HOTELS & RESORTS L.P.	Mar. 31, 2013 HOST HOTELS & RESORTS L.P. Exchangeable Senior Debentures 3.25%
Redemptions of limited partner interests for common stock	$ 4	$ 3		$ 4	$ 3
Shares issued for converted units, shares	0.2	0.2		0.2	0.2
Exchangeable Debentures			$ 174			$ 174
Debt interest rate			3.25%			3.25%
Debt converted into shares of Host Inc. common stock			11.7			11.7
Common OP unit issuances (units)						11.5